How to Add an Item to a List in Python

If you want to add values to a Python list, the method you use depends on what result you want.

This page shows the simplest ways to:

Add one item to the end of a list
Add multiple items to a list
Add an item at a specific position
Understand when to use append(), extend(), or insert()

Quick answer

numbers = [1, 2, 3]
numbers.append(4)
print(numbers)
# [1, 2, 3, 4]

Use append() to add one item to the end of a list.

What this page helps you do

Add one item to the end of a list
Add multiple items to a list
Add an item at a specific position
Understand when to use append(), extend(), or insert()

Use append() to add one item

append() adds one item to the end of a list.

It changes the original list. It does not create a new list.

fruits = ["apple", "banana"]
fruits.append("orange")

print(fruits)
# ['apple', 'banana', 'orange']

What to notice

append() adds one value
The new item goes at the end
The original list is modified

This is the best choice when you want to add a single value.

If you want a full method reference, see Python list append() method.

Use extend() to add multiple items

extend() adds each item from another iterable to the list.

An iterable is something Python can loop through, such as a list or tuple.

numbers = [1, 2, 3]
numbers.extend([4, 5, 6])

print(numbers)
# [1, 2, 3, 4, 5, 6]

Why not use append() here?

If you use append() with a list, Python adds the whole list as one item.

numbers = [1, 2, 3]
numbers.append([4, 5])

print(numbers)
# [1, 2, 3, [4, 5]]

This creates a nested list.

If you want a flat list, use extend() instead:

numbers = [1, 2, 3]
numbers.extend([4, 5])

print(numbers)
# [1, 2, 3, 4, 5]

Use extend() when you want to add many values at once.

You can learn more on the Python list extend() method page. If your goal is combining two lists, see how to merge two lists in Python.

Use insert() to add an item at a specific index

insert(index, value) adds an item before the given index.

This is useful when order matters.

letters = ["a", "c", "d"]
letters.insert(1, "b")

print(letters)
# ['a', 'b', 'c', 'd']

How it works

insert(0, item) adds at the beginning
insert(1, item) adds before index 1
Items after that position are shifted to the right

Example:

colors = ["red", "blue"]
colors.insert(0, "green")

print(colors)
# ['green', 'red', 'blue']

Use insert() when you need to place an item in a specific position.

For more details, see Python list insert() method.

Choose the right method

Pick the method based on the result you want:

Use append() for one item at the end
Use extend() for many items
Use insert() for a specific position

Here is a quick comparison:

items = [1, 2, 3]

items.append(4)
print(items)
# [1, 2, 3, 4]

items.extend([5, 6])
print(items)
# [1, 2, 3, 4, 5, 6]

items.insert(0, 0)
print(items)
# [0, 1, 2, 3, 4, 5, 6]

If lists are still new to you, it may help to read Python lists explained for beginners.

Common beginner mistakes

Here are some common problems and how to spot them.

Using append() when you meant to add items from another list

Problem:

numbers = [1, 2, 3]
numbers.append([4, 5])

print(numbers)
# [1, 2, 3, [4, 5]]

Why it happens:

append() adds its argument as one item
If that argument is a list, the list becomes a single element

Fix:

numbers = [1, 2, 3]
numbers.extend([4, 5])

print(numbers)
# [1, 2, 3, 4, 5]

Expecting append() to return the new list

Problem:

my_list = [1, 2, 3]
my_list = my_list.append(4)

print(my_list)
# None

Why it happens:

List methods like append() usually modify the list in place
append() returns None

Fix:

my_list = [1, 2, 3]
my_list.append(4)

print(my_list)
# [1, 2, 3, 4]

Using the wrong index with insert()

Problem:

names = ["Ana", "Cara"]
names.insert(1, "Ben")

print(names)
# ['Ana', 'Ben', 'Cara']

This code is correct, but beginners sometimes expect index 1 to mean "after everything." It means "before the item currently at index 1."

If you want to add at the end, use append() instead.

Confusing a nested list with a flat list

Compare these two results:

a = [1, 2]
a.append([3, 4])
print(a)
# [1, 2, [3, 4]]

b = [1, 2]
b.extend([3, 4])
print(b)
# [1, 2, 3, 4]

The first list contains a list inside it. The second is a flat list.

Quick debugging checks

If your list is not changing the way you expected, these quick checks can help:

print(my_list)
print(type(my_list))
print(len(my_list))
print(my_list[-1])

These show:

the current list contents
whether the variable is still a list
how many items are in the list
the last item in the list

FAQ

How do I add one item to a list in Python?

Use list.append(item). It adds the item to the end of the list.

How do I add multiple items to a list?

Use list.extend(iterable) to add each item from another list, tuple, or similar iterable.

How do I add an item at the beginning of a list?

Use list.insert(0, item). This puts the item at index 0.

Why did append() create a nested list?

append() adds its argument as one item. If that argument is a list, the whole list is added as a single element.

Does append() return a new list?

No. append() changes the original list and returns None.